Trinity Baptist Church was first planted in the early 1970s by two Yale Divinity School students and a Southern Baptist pastor from East Hartford. The goal was to reach out to university students and families in New Haven. The church first met in a motel, and later in a dance studio. The congregation gradually grew, and in 1988, they began meeting in Hamden. They bought a building; however, in 1994, they were unable to pay their mortgage and had to sell the building and begin renting space again in New Haven.
By October of 1999, the church had dwindled to 20-30 in attendance on Sunday mornings. The church was intending to close, when the morning of the deciding meeting they received a phone call from concerned Baptists in the city regarding a possible candidate for the pastorate. They met that evening, discussed together during the week, and voted on Sunday to call Dr. Josh Moody as their Pastor. Josh and his wife Rochelle received the call on Sunday, prayed about it overnight, and discerning unusual providence at work accepted the call without having met any of the present members of the church in person!
Since then, God has been pleased to grant the church significant and healthy growth. It adopted a Constitution, Doctrinal Statement, and Core Commitments by 2003. Elders and deacons were elected, midweek Bible studies were developed, and God's Word was faithfully preached every week. The church began reaching out to university students, homeless people, and families from New Haven and the surrounding towns.
By 2005, Sunday morning attendance had grown to 150, but the church was told by their landlord that they needed to find a new meeting place. Again, God's providence prevailed; Trinity purchased the former St. Boniface Church at 630 State St. (which had only recently become available) and by God's grace, paid off the mortgage in full in 2009.
In December 2008, Josh Moody left to become the senior pastor at College Church in Wheaton, IL. In April 2011, the church elected three co-pastors: Matt Coburn, Nick Lauer, and Greg Hendrickson.
Trinity is a member of the Western Connecticut Baptist Association, the Baptist Convention of New England, and the Southern Baptist Convention.